Dear Karthik,

Thank you for your help, the suggested settings didn't help to make convergence. coupled setting had a bad effect too (I'm solving steady not transient btw)
The initialization through fmg worked well and the solution gave a slightly better convergence as the continuity was e+02 at the end. but that's not good enough.
Also the value of the coefficient of moment was way lower than expected, this is all because the Y+ value is too high.
I tried reducing it with inflation at the blade walls but this had terrible results on the rest of the hex mesh ans spoiled the quality awfully, inflation won't work with hex mesh.

I'm not looking to make the inner domain structured too, that way I'll have edges in there around the blades to do bias and reduce the Y+ through that.

Any clue how to structure this rotating domain at the geometry